Overheat thermostat fits these Ravenheat boilers:

CS80, CS90

CSI 85, CSI 85B, CSI 85B T, CSI 85T, CSI SYSTEM AAA, CSI SYSTEM AAA T, CSI SYSTEM, CSI SYSTEM

CSI85 780 series

CSI 120, CSI 150

LITTLE STAR LS 100, LITTLE STAR LS 100 T, LITTLE LS 80(T), LITTLE STAR LS 80
  
RSF 100E, RSF 100E T, RSF 20/20E, RSF 20/20ET, RSF 25/20E, RSF 25/20ET, RSF 25/25E, RSF 25/25ET
 
RSF 82E, RSF 82E T, RSF 84E, RSF 84E T
 
SILVER STAR 24, SILVER STAR 24T, SILVER STAR 29, SILVER STAR 29T
 
WHITE STAR 24, WHITE STAR 24T, WHITE STAR 29, WHITE STAR 29T

WH80, WH90  

HE80, HE98

HE80S, HE 98S